If electrons are accelerated from rest in an electron gun by sending them through a potential difference of 1000 V, what is the speed of the electrons?
A. 
B. 
C. 
D. 
E. 
C.
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Kinetic Energy: A 1000-kg car is moving at 15 km/h. If a 2000-kg truck has 23 times the kinetic energy of the car, how fast is the truck moving?
A. 51 km/h B. 72 km/h C. 61 km/h D. 41 km/h
In a system of N gas molecules, the individual speeds are v1, v2, ..., vN . The rms speed of these molecules is:
A. 1 N ?v1 + v2 + ... + vN B. 1 N v2 1 + v2 2 + ... + v2 N C. (v2 1 + v2 2 + ... + v2 N )/N D. [(v1 + v2 + ... + vN )/N] 2 E. 0(v1 + v2 + ... + vN )2/N
A child has a temperature of 101°F. If her total cross-sectional area is 2 m2, find the energy lost each second (in W) due to radiation, assuming the emissivity is 1 . (Assume the room temperature is 70°F.)
a. 217 b. 180 c. 90 d. 68 e. 850
Your friend says that, when a compass is taken across the equator, it turns around and points in the opposite direction. Your other friend says that this is not true, that people in the Southern Hemisphere use the south magnetic pole of the compass to point toward the nearest pole. You're on; what do you say?
What will be an ideal response?